I’m sure Chris will chime in as well but most pilots have Recurrent training once a year however some airlines use a 9 mos cycle. This is usually a combination of Sim, online and actual classroom depending on the airline. As Chris said at UA they now have all their ground school online and many airlines are going this way. At Hawaiian we have online (CBT, computer based training) but we also still have classroom days which I personally like since some classes like CRM (Crew Resource Mgmt, the class I facilitate) require interaction. Capts also receive a line check (during an actual flight) once a year.
All pilots require the same recurrent training regardless of seniority. Why wouldn’t they?